package gear.motion.easing {
	public class Quartic {
		public static function easeIn(t : Number, b : Number, c : Number, d : Number) : Number {
			return c * (t /= d) * t * t * t + b;
		}

		public static function easeOut(t : Number, b : Number, c : Number, d : Number) : Number {
			return -c * ((t = t / d - 1) * t * t * t - 1) + b;
		}

		public static function easeInOut(t : Number, b : Number, c : Number, d : Number) : Number {
			if ((t /= d / 2) < 1)
				return c / 2 * t * t * t * t + b;
			return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
		}
	}
}
